#include <chrono>
#include <iostream>

using namespace std::chrono_literals;

int main()
{
    auto nowMs = std::chrono::duration_cast<std::chrono::milliseconds>(
        std::chrono::steady_clock::now().time_since_epoch()).count();
    std::cout << "now ms: " <<  nowMs << std::endl;
    return 0;
}
